Financial Instruments (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Summary of assets measured at fair value on a recurring basis
Total assets	$ 40,853	$ 42,999
Level 1
Summary of assets measured at fair value on a recurring basis
Total assets	1,853	22,999
Level 2
Summary of assets measured at fair value on a recurring basis
Total assets	39,000	20,000
Money market funds
Summary of assets measured at fair value on a recurring basis
Cash and cash equivalents	1,853	22,999
Money market funds | Level 1
Summary of assets measured at fair value on a recurring basis
Cash and cash equivalents	1,853	22,999
Reverse repurchase agreements
Summary of assets measured at fair value on a recurring basis
Short-term investments	39,000	20,000
Reverse repurchase agreements | Level 2
Summary of assets measured at fair value on a recurring basis
Short-term investments	$ 39,000	$ 20,000